Support for Alpine images (using /bin/sh) in Pipelines

When using Alpine Linux based docker container(e.g. golang:1.7beta1-alpine), will occur

docker: Error response from daemon: Container command '/bin/bash' not found or does not exist.

Because docker run command with --entrypoint=/bin/bash, but Alpine Linux have not /bin/bash.

Alpine Linux is a next standard based image. I think there is a need to support it.

Do you have any idea or fix plan?